Modular LED system for a lighting assembly

ABSTRACT

One non-limiting example of an LED system for a lighting assembly includes a heat sink having a plurality of base plates. Each of the base plates has a pair of opposing edges disposed adjacent to a corresponding one of the other base plates. Additionally, each base plate has an outer face extending between the opposing edges; and the LED system further includes a plurality of LEDs attached to the outer face of each base plate. A fan is releasably attached to a bottom portion of the heat sink and configured to produce a flow of air through the heat sink from the bottom portion through a top portion of the heat sink to maintain an operating temperature of the LED system.

TECHNICAL FIELD

The present invention generally relates to a light emitting diode(“LED”) system, and more specifically, a lighting assembly that includesthe LED system and a reflector body for uniformly and efficientlydispersing light emitted by the LED system for commercial and industrialfacilities having large floor spaces that require adequate light, suchas indoor sports facilities, fieldhouses, manufacturing plants,warehouses, airports, convention centers, or other various indoorapplications.

BACKGROUND OF THE DISCLOSURE

Light fixture manufacturers continuously develop lighting assemblieshaving LED systems in view of the various benefits provided by LEDs, ascompared to traditional light sources. Examples of these benefits caninclude a longer service life, higher energy efficiency, fulldimmability and instant lighting. These benefits can provideconsiderable value in facilities having large floor spaces that requirelight in multiple directions. However, it is particularly difficult toachieve adequate lighting of large floor spaces due to the height of thelight fixtures relative to the area to be lit and the width of the areato be lit relative to the number of light fixtures. In one type ofapplication, such as indirect lighting, the light fixture reflects lightoff a ceiling or structure above the light fixture. The LED systems cancreate hot spots or glare when viewed from below, making the lightinginadequate.

In an attempt to uniformly reflect light emitted by the LEDs anddissipate heat generated by the same, some existing lighting assembliesutilize complex components, optics and circuitry to achieve these goals.However, these lighting assemblies can have a high overall weight, andbe somewhat difficult and expensive to manufacture. In one such example,the LEDs are mounted in a horizontal position to a rectangularly shapedheat sink and the light is directed upwards toward the structure abovethe LED such that the light is emitted without a reflector. Onedisadvantage is that dust and other impediments can sit on the LEDsmaking it necessary to service the fixture to maintain the same lightoutput. Further, the heat sink is large and heavy making it moredifficult to install and inapplicable to some applications, such as domestructures. Typically, such horizontal LEDs can weigh upwards of 60pounds due to the heat sink. Other lighting assemblies may havedome-shaped reflectors and LEDs disposed within a hole defined at anapex of the reflective dome. However, these assemblies are typically forsmaller light output applications and do not generate large amounts ofheat or may not efficiently dissipate heat generated by the LEDs. Theseassemblies also do not uniformly distribute light because much of thelight can exit the lighting assembly directly without being reflectedand scattered by the reflector.

SUMMARY OF THE DISCLOSURE

One non-limiting example of an LED system includes a heat sink having aplurality of base plates. Each base plate can include a pair of opposingedges and an outer face extending between the opposing edges.Additionally, the LED system includes a plurality of LED boards, whichare coupled to the outer face. Each LED board has a plurality of LEDsand is spaced apart from the opposing edges by at least one inch.

A non-limiting example of a lighting assembly for illuminating an areaincludes a reflector body surrounding an opening. The lighting assemblycan further include an LED system, which has a heat sink and a pluralityof LED boards. The heat sink includes a plurality of base plates. Eachbase plate includes a pair of opposing edges, an outer face extendingbetween the opposing edges, and an inner face. The LED boards arecoupled to the outer face of a corresponding one of the base plates,respectively. Each LED board includes a plurality of LEDs and is spacedapart from each of the opposing edges. Additionally, the heat sinkfurther includes a plurality of fins extending from the inner face.These fins provide a peak profile decreasing from a middle portion ofthe corresponding base plate laterally outward to the opposing ends.Each base plate has a predetermined width, as measured in a directionextending perpendicularly from one of the opposing edges to the other ofthe opposing edges. The height profile includes a maximum heightextending perpendicularly from the middle portion of the correspondingbase plate. A ratio of the predetermined width to the maximum height isat least 3:1.

BRIEF DESCRIPTION OF THE DRAWINGS

Referring now to the drawings, exemplary illustrations are shown indetail. Although the drawings represent representative examples, thedrawings are not necessarily to scale and certain features may beexaggerated to better illustrate and explain an innovative aspect of anillustrative example. Further, the exemplary illustrations describedherein are not intended to be exhaustive or otherwise limiting orrestricting to the precise form and configuration shown in the drawingsand disclosed in the following detailed description. Exemplaryillustrations are described in detail by referring to the drawings asfollows:

FIG. 1 is an environmental view of two exemplary lighting assemblies,suspended from a ceiling for an indirect lighting application.

FIG. 2A is a perspective view of one of the lighting assemblies of FIG.1.

FIG. 2B is a perspective view of a lighting assembly of anotherembodiment having a pole mount capable of being used in a direct or anindirect lighting application.

FIG. 2C is a perspective view of a lighting assembly having a strutmount.

FIG. 3 is a partially cutaway view of the lighting assembly of FIG. 2A,showing the lighting assembly having one example of a LED system.

FIG. 4 is a perspective view of the lighting assembly of the subjectinvention, showing the attachment mechanism and the wire screen removed.

FIG. 5 is an exploded view of the lighting assembly without the LEDsystem to better illustrate the reflector body and the housing, with apartially cutaway view of the housing.

FIG. 6A is an exploded view of a lower portion of the LED systemillustrating the LED system having an LED housing, a mounting plate anda series of LED drivers.

FIG. 6B is an exploded view of an upper portion of the LED system ofFIG. 6A illustrating the LED system further including a cooling devicesuch as a fan, a heat sink and series of LEDs.

FIG. 7A is a perspective view of the LED system.

FIG. 7B is a top plan schematic view of the heat sink illustrating threeLED boards exploded radially outward from a corresponding one of threerecesses of the heat sink.

FIG. 8 is a perspective view of the LED system of FIG. 7 with a LEDhousing removed to better illustrate the heat sink and the LED driversattached to the mounting plate.

FIG. 9 is an enlarged view of the LED system of FIG. 8, with a proximalone of the LED drivers removed to show the fan disposed under the heatsink.

FIG. 10 is a schematic diagram of another exemplary LED system, which issimilar to the LED system of FIGS. 6A and 6B and further includes a fandriver configured to provide power to the fan.

FIG. 11 is a schematic diagram of still another exemplary LED system,which is similar to the LED system of FIGS. 6A and 6B and furtherincludes a thermal switch configured to provide power to the LEDs.

FIG. 12 is a schematic diagram of yet another exemplary LED system,which is similar to the LED system of FIGS. 6A and 6B and furtherincludes a thermal switch configured to provide power to the fan whenthe temperatures of the heat sink and switch exceed a predeterminedthreshold.

FIG. 13 is a schematic diagram of another exemplary LED system that issimilar to the LED system of FIGS. 6A and 6B and further includes afailsafe switch configured to stop providing power to the LEDs when thefan is not operating.

FIG. 14 is a top plan view of the reflector body and the heat sink,showing the reflector body having first reflectors and second reflectorsthat are configured to prevent the emission of yellow light from thelighting assembly.

FIG. 15 is a plan view of one of the first reflectors of FIG. 14.

FIG. 16 is a plan view of one of the second reflectors of FIG. 14.

FIG. 17 is a perspective view of one of the first reflectors of FIG. 14.

FIG. 18 is a perspective view of one of the second reflectors of FIG.16.

FIG. 19 is a perspective of a portion of the reflector body of FIG. 14.

FIG. 20 is an enlarged view of an upper portion of the reflector body ofFIG. 14.

DETAILED DESCRIPTION OF THE DISCLOSURE

The subject invention relates to an exemplary modular light emittingdiode (“LED”) system for a lighting assembly that includes a pluralityof LEDs and a heat sink configured to efficiently dissipate heatproduced by the LEDs while having a simple and lightweight construction.

Referring to FIG. 1, two exemplary indirect lighting assemblies 100 areconfigured to uniformly distribute light in multiple directions, so asto illuminate a surrounding environment 102. Exemplary environmentsinclude an indoor sports facility, a manufacturing plant, a fieldhouse,a warehouse, an airport, a convention center, various indoor facilitieshaving large floor spaces with ceilings from 16 feet to 100 feet inheight, or any other suitable environment that requires adequate lightto conduct an activity. While FIG. 1 illustrates two lighting assemblies100, more or fewer lighting assemblies 100 may be used according thelighting requirements of the environment 102. In this example, thelighting assemblies are identical to one another and, thus, thefollowing description may be directed to both of the assemblies.

Referring still to FIG. 1, each one of the lighting assemblies 100 mayinclude an attachment mechanism 104 configured to attach thecorresponding lighting assembly 100 to a ceiling 106. In onenon-limiting example, the attachment mechanism 104 can include a pendantmount 108, which has one end attached to a support mechanism (not shown)coupled to the ceiling 106 and further includes an internal channel (notshown) for passing electrical wiring therethrough. The attachmentmechanism 104 can also have a crossbar 110, which is attached to anopposing end of the pendant mount 108 and disposed perpendicularly tothe same. However, the attachment mechanism can instead include morethan one pendant mount 108 or include a cable mounting mechanism thatuses multiple cables that are secured to the ceiling. Of course, anysuitable method of coupling the lighting assembly 100 to the ceiling 106can be used.

As shown in FIG. 1, the exemplary lighting assembly 100 operates as anindirect-light assembly, such that the lighting assembly 100 isconfigured to emit light onto the ceiling 106, which in turn reflectslight to an area below the lighting assembly 100. For illustrativepurposes, light rays are shown with dashed lines in FIG. 1. FIG. 2Ashows an enlarged view of the indirect mount light assembly 100 of FIG.1, which can be used with the subject invention to emit light onto anarea below by reflecting the light off the ceiling 106.

FIG. 2B shows another light assembly 100′ that can be used with thesubject invention to emit light directly or indirectly onto an areabelow with or without reflecting the light off the ceiling 106. Withattention to FIG. 2B, the lighting assembly 100′ may also include theattachment mechanism 104′ configured to allow the housing 112′ to movein various directions. Specifically, the attachment mechanism 104′includes a generally U-shaped portion 107′ which couples to thecontinuous side wall 126′. The housing 112′ is pivotably coupled to theattachment mechanism 104′ such that the housing 112′ may pivot withinthe U-shaped portion 107′ between various angles relative to theattachment mechanism 104′ for positioning the lighting assembly 100′.The attachment mechanism 104′ further includes a pole or wall mount 108′disposed between the U-shaped portion and the ceiling 106′ for couplingthe lighting assembly 100′ to the ceiling 106′, the wall, or otherstructure. The housing 112′ can pivot, both up and down and left andright, to allow for additional positioning of the lighting assembly100′. FIG. 2C is a perspective view of another lighting assembly havinga strut mount for Unistrut applications. It is to be appreciated thatdifferent mountings can be used without deviating from the scope of thesubject invention.

Referring to FIGS. 3 through 5, the lighting assembly 100 generallyincludes a housing 112. As best shown in FIGS. 3 and 4, a modular LEDsystem 114 and a reflector body 116 are shown in the assembly 100. FIG.3 illustrates an exploded view of the lighting assembly, without the LEDsystem to better illustrate the housing 112. As best shown in FIG. 5,the housing 112 includes a bottom wall 120 that defines a center hole122 and an outer periphery 124. The housing 112 can further include anannular sidewall 126, which extends from the outer periphery 124 of thebottom wall 120 and defines a cavity 128 therein. The sidewall 126 canterminate at a rim 130, and the rim 130 can engage the crossbar 110(FIG. 1), so as to attach the housing 112 to the attachment mechanism104. However, other portions of the housing 112 or the lighting assembly100 can be coupled to the attachment mechanism 104 for attaching thelighting assembly 100 to the ceiling. In another example, no portion ofthe housing 112 may be coupled to an attachment mechanism 104 when, forexample, the lighting assembly 100 is not mounted to the ceiling 106.

The housing 112 may be integrally formed as a one-piece body by diecasting, stamping, extrusion or other suitable manufacturing processes.However, the housing can instead have any number of parts and beproduced by any suitable manufacturing process.

FIGS. 6A and 6B are enlarged exploded views of corresponding portionsthe LED system 114. In this example, the reflector body 116 is receivedwithin the cavity 128 of the housing 112, and at least a portion of theLED system 114 is disposed within the reflector body 116.

Referring to FIG. 6A, the bottom portion of the LED system 114 caninclude a LED cap 140 configured to contain or hold at least a portionof the components of the LED system 114. In particular, the cap 140includes a bottom 144 with apertures 146 and an annular sidewall 150extending from the bottom 144, and the sidewall 150 includes a grill orseries of vents 152 circumferentially spaced apart from one another. Thevents 152 are configured to pass a flow of air therethrough, whichremoves heat from the LED system 114. Of course, the LED cap 140 canhave one or more openings disposed in various suitable configurations topass a flow of air through the lighting assembly.

The sidewall 150 terminates at an end with a flange 154 extendingradially outward therefrom. The flange 154 is configured to support thecap 140 on a portion of the bottom wall 120 (FIG. 5) adjacent to thecenter hole 122 of the housing 112. This flange 154 may be attached tothe bottom wall 120 by one or more threaded fasteners, resilient clips,adhesives or other suitable fasteners to permit access to individualcomponents of the LED system 114 for repairing or replacing any damagedcomponents. However, the flange 154 can be supported by the bottom wall120 without any fasteners attaching the cap 140 to the housing 112.Furthermore, it is contemplated that the cap 140 can be an integralportion of the bottom wall 120 of the housing 112. In still anotherexample, the LED system 114 may not have the cap 140, thus placing othercomponents of the LED system 114 entirely within the cavity 128 of thehousing 112 or within a separate body external to the housing 112.

As shown in FIG. 6A, the LED system 114 further includes a mountingplate 156, which is configured to be received within the cap 140 andsupport multiple modular components of the LED system 114 therein. Inone example, various components of the LED system 114 are releasablyattached to the mounting plate 156, so as to provide a modularconstruction that permits one or more damaged components to be easilyremoved, inspected, repaired or replaced. Examples of releasablefasteners can include threaded fasteners, resilient clips,tongue-in-groove fasteners, hook and loop fasteners, adhesives and othersuitable releasable fasteners. However, it is contemplated that anysuitable fastening method can be used to attach other components of theLED system 114 to the mounting plate 156.

The mounting plate 156 can be a disc 158 that defines a center hole 160.The disc 158 can have one or more protrusions 162, 164, 166 configuredto be attached to the sidewall 150 of the cap 140 by any suitablefasteners. The protrusions 162, 164, 166 may be configured to align thecenter hole 160 with the apertures 146 of the cap 140, thus facilitatingwith an unobstructed flow of air into the lighting assembly 100.

Referring to FIG. 6B, the LED system 114 further includes a heat sink168 for attaching to the mounting plate 156. This exemplary heat sink168 includes three base plates 184, 186, 188 spaced from one another andattached to the mounting plate 156 by a series of brackets 190, 192, 194and threaded fasteners 196. However, the heat sink 168 may includemultiple base plates 184, 186, 188 depending upon the specific lightingapplication. Each one of the base plates 184, 186, 188 has a pair ofopposing edges 198, 200 extending between a top portion 212 of the heatsink 168 and a bottom portion 210 of the heat sink 168. In addition, theopposing edges 198, 200 are disposed adjacent to corresponding edges ofother base plates 184, 186, 188, and each one of the base plates 184,186, 188 has an outer face 202. The outer face 202 may be a rectangularsurface area extending between the opposing edges 198, 200, and the topand bottom portions 212, 210 of the base plates 184, 186, 188. In theexample shown, but in no way limiting, the heat sink 168 has a generallytriangular prism shaped body 170 and the outer face 202 is rectangularin shape so as to form the triangular prism shaped body 170 when theedges of the plates 184, 186, 188 are disposed adjacent to one another.Adjacent edges of corresponding plates are spaced apart from one anotherto define corresponding open gaps 178, 180, 182.

The heat sink 168 defines multiple cooling passages for a flow of air toefficiently dissipate heat from LEDs 204. In particular, each one of thebase plates 184, 186, 188 has an inner surface 206 and a plurality offins 208 extending therefrom. The fins 208 extend laterally inwardtherefrom along a width of the heat sink 168. Thus, the fins 208 extendin a radially inward direction with respect to adjacent correspondingportions of the reflector body 116 that concentrically surrounds theheat sink 168.

The fins 208 extend from a bottom portion 210 of each one of the baseplates 184, 186, 188 to a top portion 212 of the corresponding baseplates 184, 186, 188. In this example, the fins 208 are sinusoidal finshaving one or more undulating surface areas that provide a largersurface area exposed to a cooling flow of air. The fins 208 have a peakprofile decreasing from a middle portion 214 of the corresponding baseplate laterally outward to the opposing edges 198, 200, thus providing atriangular fin profile as shown in an end view of the heat sink 168. Inone example, each one of the base plates 184, 186, 188 has apredetermined width, and the height profile includes a maximum height,such that a ratio of the width to the maximum height is at least 3:1.However, it will be appreciated that the width and the maximum heightcan be greater or less than this ratio. The subject invention optimizesthe transfer of heat from the LED boards 228, 230, 232 through the baseplates 184, 186, 188 and into the fins 208. If the fins 208 on themiddle portions 214 of the base plates 184, 186, 188 were longer, thiswould cause the LEDs 204 to be closer to the reflector body 116, andthen less light may be output.

As best shown in FIG. 7B, the fins 208 are spaced apart from one anotherso as to define a plurality of fin spacings 216 between adjacent fins208. Additionally, the fins 208 on base plates 184, 186, 188 have aplurality of ends 218 coordinating with one another to define threecross slots 220, 222, 224 in fluid communication between the finspacings 216 and the open gaps 178, 180, 182, such that heat istransferred from the fins 208 to air within the fin spacings 216 and theheated air travels from the fin spacings 216, through the cross slots220, 222, 224 and exits the heat sink 168 through the open gaps 178,180, 182.

Air within the fin spacings 216 may primarily flow in a longitudinaldirection within the fin spacings 216 along the entire height of theheat sink 168, from the bottom portion 210 through the top portion 212.It is contemplated that the heat sink 168 can have one or morenon-sinusoidal fins 208 that extend from other portions of thecorresponding base plates 184, 186, 188 with various height profiles.Thus, the fins 208 can define more or fewer fin spacings 216, crossslots 220, 222, 224 and open gaps 178, 180, 182 arranged in other lineardirections or in non-linear directions, so as to provide varioussuitable configurations of cooling passages.

Referring back to FIG. 6B, the LED system further includes a pluralityof LEDs 204 attached to the outer face 202 of a corresponding one of thethree base plates 184, 186, 188. As one example, the LEDs 204 arearranged on the middle portion 214 of each base plate 184, 186, 188 andare spaced apart from the opposing edges 198, 200, by a distance X1,such that heat produced by the LEDs 204 can be more efficientlytransferred to the tallest fins 208 and efficiently dissipated into thefin spacings 216 between those fins 208. As one example, the LEDs 204are spaced apart from the opposing edges 198, 200 by at least one halfof an inch.

Moreover, in this example, the LEDs 204 are attached to the top portion212 of the heat sink 168, and the bottom portion 210 of the heat sink168 that is adjacent to the reflector body 116 does not include anyLEDs. Thus, the LED system 114 is configured to emit light laterallytoward a portion of the reflector body 116 that is configured to reflectthe light to at least one other portion of the reflector body 116 beforethe light is emitted from the lighting assembly 100 in a scattered anduniform distribution. Said differently, the LEDs 204 direct light in ahorizontal direction which is then reflected out of the lightingassembly 100. In this manner, the subject invention can direct the lightthat is emitted to desired locations if needed. Further, even though theLEDs 204 are located at the top portion 212, the fins 208 extend theentire length to ensure sufficient dissipation of the heat. It is to beappreciated that the fins 208 may extend less then the entire length solong as sufficient heat is dissipated to maintain the temperature at adesired point.

The LEDs 204 in one form may be provided as three 60 Volt class 2,six-channel LED boards 228, 230, 232, and each LED board 228, 230, 232can include 20 LEDs 204. However, the LED system 114 can have any numberof LEDs 204 provided by any suitable boards or other electrical systems.For example, a single channel board may be used with 24 LEDs 204 or asix-channel board could be used with 18 LEDs 204. These LED boards 228,230, 232 may be modular to the extent that they are releasably fastenedto the heat sink 168, and can thus be removed for repair or replacement.As one example, one or more LED boards 228, 230, 232 may be attached tothe heat sink 168 by resilient clip fasteners or an adhesive. Of course,the LED boards 228, 230, 232 can be attached to the heat sink 168 by anysuitable fastening method.

Referring to FIG. 7A, the base plates 184, 186, 188 may define recesses229, 231, 233 that the LED boards 228, 230, 232 can be received in. Inparticular, each one of the LED boards 228, 230, 232 can be spaced apartfrom each of the opposing edges 198, 200 by the distance X1, which isless than one inch and preferably one half of an inch and further spacedapart from the top portion 212 by a distance X2, which is less than twoinches, preferably from one to two inches, and more preferably one inch.The spacing of the LED boards 228, 230, 232 ensures adequate surfacearea of the heat sink 168 adjacent to the LED boards 228, 230, 232 totransfer heat and maintain a desired working temperature. The LED boards228, 230, 232 include a temperature sensor area 500, or thermalresistance junction or Tc, that is the temperature measuring point ofthe LED boards 228, 230, 232. It has been determined that the length ofthe base plate should be about twelve inches and preferably from eightto twelve inches to ensure adequate surface for heat transfer. However,the length of the base plate can be greater or less than this range.

Referring to FIGS. 7B and 8, the LED system 114 further includes one ormore LED drivers 234, 236, 238 configured to provide power to the LEDs204. In this example, the LED system 114 includes three LED drivers 234,236, 238, which are configured to provide power to a corresponding oneof the three LED boards 228, 230, 232. Each one of the LED drivers 234,236, 238 is electrically coupled to a power cable 240. The power cable240 is coupled to an electric power source 242 (FIG. 1) for supplyingelectricity to the LED system 114. The electric power source 242 can bea standard electrical outlet, receptacle, or plug. However, anyappropriate electric power source 242 may be utilized. In someembodiments, the lighting assembly 100 may also be directly wired to thepower source 242, generally known in the art as hard wired, withoutdeviating from the scope of the present invention. Additionally, itshould be appreciated that alternative types of LED drivers, powersupplies or AC/DC converters will be required based on the type of lightsource chosen and will not deviate from the subject invention.

The LED system 114 can further include retainers configured to attachone or more LED drivers 234, 236, 238 to the mounting plate 156. Asshown in FIG. 6A, the LED system 114 includes three retainers 244, 246,248 for attaching a corresponding one of the LED drivers 234, 236, 238to the mounting plate 156. Each one of the retainers 244, 246, 248 canbe a bracket or formed strip of metal having multiple sections. As bestshown in FIG. 9, one section of the bracket can be a detent segment 250configured to contact an upper surface 252 of the corresponding LEDdriver 234, 236, 238 and hold the same on one or more spacers 254, 256attached to the mounting plate 156. These spacers 254, 256 may beconfigured to space apart a bottom surface of the corresponding LEDdriver 234, 236, 238 from the mounting plate 156, thus providing a flowpath between the same to dissipate heat from the LED drivers 234, 236,238, as well as from the heat sink 168.

Additionally, each bracket 190, 192, 194 can further include a spacingsegment 258 that extends perpendicularly from the detent segment 250along an inboard surface 260 of the corresponding LED driver 234, 236,238. The detent segment 250 may be configured to hold the correspondingLED driver 234, 236, 238 a minimum distance apart from the flow pathsdefined by the center hole 122 and apertures 146. Thus, the spacingsegment 258 can prevent the corresponding LED driver 234, 236, 238 fromobstructing the flow of air through the heat sink 168 and furtherprevent the LED driver 234, 236, 238 from receiving excessive heat fromthe heat sink 168 and the LEDs 204. Each bracket 190, 192, 194 canfurther include a pair of tabs 262, 264 configured to be attached to arespective one of the LED cap 140 and the mounting plate 156 by threadedfasteners. Thus, the bracket 190, 192, 194 can be removed to permit therepair or replacement of a damaged LED driver 234, 236, 238. It iscontemplated that the retainer 244, 246, 248 can have other suitablefeatures and be attached to the LED system 114 by any suitable fasteningmethod, such as a U-shaped resilient clip. Furthermore, other examplesof the LED system 114 may not include the retainer 244, 246, 248,particularly an LED system 114 that does not include an LED driver 234,236, 238.

Referring back to FIG. 6B, the LED system 114 further includes a coolingdevice 266 disposed adjacent to the bottom portion 210 of the heat sink168. The cooling device 266 may include a fan system, a heat exchangingthermal compound, a liquid cooling apparatus, a heat pipe, and the like.The cooling device 266 is configured to remove heat from the heat sink168 from the bottom portion 210 through the top portion 212 of the heatsink. In particular, in one embodiment, the fan 266 is attached to themounting plate 156 by a series of threaded fasteners 268 andcorresponding spacers 270, such that the fan 266 has an axis of bladerotation that is collinear with the central axis C of the lightingassembly 100. The spacers 270 set a predetermined distance between thetop of the fan 266 and the bottom of the heat sink 168. Thepredetermined distance is preferably from 0.5-2 inches and morepreferably 0.5-1.5 inches. The most preferred is for the predetermineddistance to be 0.5-1 inches. When the predetermined distance is toolarge or too small, the amount of heat transfer is inadequate. Inanother embodiment, the heat pipe can engage the heat sink and transferheat through the heat pipe and into the surrounding air.

Referring to now to FIG. 9, the fan 266 is shown spaced apart from themounting plate 156, such that the fan can more efficiently draw airradially inward through the vents 152 of the cap 140, thus increasingthe amount of air drawn into the LED system and cooling the LED drivers234, 236, 238 and the heat sink 168. The fan 266 is releasably attachedto the mounting plate 156 by threaded fasteners 268, thus permittingaccess or removal of the fan to easily repair or replace the same. Inthis example, the fan 266 is electrically coupled to one or more of theLED drivers 234, 236, 238, which are configured to provide power to thefan 266. It is to be appreciated that the fan 266 may be operated ineither direction to draw or push air through the lighting assembly 100.For example, it has been found to be particularly useful to operate thefan 266 in reverse mode when the lighting assembly 100 is in a directmount application such that air is pulled through the lighting assembly100, which aids in keeping the assembly free of dust and debris.

FIG. 10 is a schematic diagram of a portion of another exemplary LEDsystem 1114, which is substantially similar to the LED system 114 ofFIGS. 6A and 6B, and includes many of the same components. Some of thesecomponents are illustrated in FIG. 10 and identified by correspondingreference numerals in the 1100 to 1270 series, including the powersource 1242, and LED boards 1228, 1230, and 1232. However, in contrastto the LED system 114 of FIGS. 6A and 6B, the LED system 1114 in thisform can further include a separate fan driver 1272 or other powersupply electrically coupled to the fan 1266 to provide power to thesame, without any of the LED drivers 1234, 1236, 1238 being coupled tothe fan 1266.

FIG. 11 is a schematic diagram of a portion of still another exemplaryLED system 1314, which is substantially similar to the LED system 114 ofFIGS. 6A and 6B, and has many of the same components. A few of thesecomponents are illustrated in FIG. 11 and identified by correspondingreference numerals in the 1300 to 1470 series. However, as compared tothe LED system 114 of FIGS. 6A and 6B, the LED system 1314 in thisexample can further include one or more thermal controllers or switches1474 in connection between the LED drivers 1434, 1436, 1438 and thepower source 1442. These thermal switches 1474 can be configured to openwhen the temperature of the heat sink or thermal switch is higher than apredetermined temperature threshold, thus stopping the supply of powerto the LED boards 1428, 1430, 1432 and decreasing any potential wear ordamage to the components as caused by overheating. The predeterminedtemperature threshold can be measured with the Tc 500 of the LED boards1428, 1430, 1432 or internally within the system. Of course, othersuitable devices, controllers and sensors can be used to turn off theLEDs when they generate heat above a predetermined threshold.

FIG. 12 is a schematic diagram of a portion of yet another exemplary LEDsystem 1514, which is substantially similar to the LED system 114 ofFIGS. 6A and 6B, and has many of the same components. Some of thesecomponents are illustrated in FIG. 12 and identified by correspondingreference numerals in the 1500 to 1670 series. However, in contrast tothe LED system 114 of FIGS. 6A and 6B, the LED system 1514 can furtherinclude one or more thermal controllers or switches 1676 in connectionbetween the fan 1666 and the corresponding LED driver 1634, 1636, 1638,(connected to power source 1642) and each thermal switch 1676 isconfigured to close when the temperature of the heat sink 1560, the LEDboards 1628, 1630, 1632, or thermal switch 1676 is at least apredetermined temperature threshold, such as 70 degrees Celsius. In thismanner, the fan can start and stop based on temperature.

Referring to FIG. 13, yet another example of an LED system 1714 may besubstantially similar to the LED system 114 shown in FIGS. 6A and 6B andhave the same components, with a portion of these components illustratedin FIG. 13 and being identified in corresponding reference numerals inthe 1700 to 1870 series. However, this exemplary LED system 1714 caninclude one or more failsafe controllers or switches 1878 (connected topower source 1842) in connection between the LED boards 1828, 1830, 1832and the LED drivers 1834, 1836, 1838. These switches 1878 are configuredto turn off the LEDs when the fan 1866 is not operating.

Referring to FIG. 14, the reflector body 116 includes a first array ofreflectors 280 disposed about the central axis C and collectivelyforming a dome-shaped configuration. Each one of the first array ofreflectors 280 defines a lower end 282, an opposing upper end 284 and aplurality of planar surfaces 286 defined between the lower end 282 andthe upper end 284. The planar surfaces 286 are separated from oneanother by discrete horizontal bends 288, with the planar surfaces 286collectively forming an arcuate configuration 290 between the lower end282 and the upper end 284, and adjacent ones of the first array ofreflectors 280 are separated by a corresponding vertical edge or crease292 therebetween. Each one of the creases 292 is offset from a lateralaxis of each one of the corners 172, 174, 176, with each lateral axisextending radially outward from a center of the heat sink 168 andthrough the corners 172, 174, 176 of the heat sink 168. One non-limitingexemplary benefit of this arrangement is that any yellow light emittedby the LEDs 204 is not reflected out of the lighting assembly 100. Thelower end 282 of the first reflectors 280 correspond with one another todefine a center hole 310. The center hole 310 is provided for allowing aportion of the LED system 114 to pass therethrough and into thereflector body 116.

The reflector body 116 further includes a second array of reflectors 312disposed about the central axis C. Each one of the second array ofreflectors 312 includes a planar left face 314 and a planar right face316 separated by a vertical bend 318. The vertical bend 318 of one ormore of the second array of reflectors 312 intersects the lateral axisof one of the corners 172, 174, 176, which extends radially outward froma center of the heat sink 168 and through the corresponding corner 172,174, 176 of the heat sink 168.

FIG. 15 shows a plan view of one of the first reflectors 280 in a planarview prior to being formed and shaped. A first flange 294 may extendfrom the upper end 284 for attaching to the lower ring 296 and securingthe first reflectors 280 in a first array to one another.

FIG. 16 illustrates a plan view of one of the second reflectors 312prior to be formed and shaped.

FIG. 17 illustrates a perspective view of the first reflector 280 ofFIG. 15 after being initially bent into a shape to couple with thesecond reflector 312.

More specifically, as shown in FIG. 17, the first reflector 280 includesa first side 298 and a second side 300. A plurality of first attachmentelements 302 may extend from the first side 298. The first attachmentelements 302 are further defined as tabs 304. A plurality of secondattachment elements 306 may extend from the second side 300 and define aslot 308. Each slot 308 is adapted to accept one of the tabs 304extending from the next adjacent first reflector 280 for securing thefirst reflectors 280. It will be appreciated that other methods ofattaching the first reflectors 280 together may be employed withoutdeviating from the subject invention.

FIG. 18 illustrates a perspective view of the second reflector 312 ofFIG. 16 after being initially formed, but prior to being coupled to thefirst reflector 280 of FIG. 17.

As shown in FIGS. 19 and 20, the first reflectors 280 are disposedadjacent to one another in circumferential direction so as to providethe first array. Each one of the first reflectors 280 are in an obtuseangular relationship with the next adjacent first reflector 280. As aresult of the obtuse angular relationships, the first reflectors 280collectively form a dome-shaped configuration. For illustrative purposesonly, this obtuse angular relationship is illustrated as β. Typically βis of from about 110° to about 170°, more typically from about 120° toabout 150°.

Each of the planar surfaces 286 are in an obtuse angular relationshipwith each of the next adjacent planar surfaces 286. For illustrativepurposes only, this obtuse angular relationship is illustrated as a inFIG. 19. It will be appreciated that the obtuse angular relationship αbetween each of the planar surfaces 286 may vary along the firstreflector 280. Said differently, each of the planar surfaces 286 are atdifferent obtuse angles relative to one another. The obtuse anglesbetween the planar surfaces 286 progressively get steeper moving fromthe lower end 282 toward the upper end 284 along each of the firstreflectors 280, such that an arcuate configuration 290 is formed, asbest shown in FIG. 17. Additionally, each of the planar surfaces 286increase in size, moving from the lower end 282 toward the upper end284. As a result of the obtuse angular relationship between adjacentplanar surfaces 286, the planar surfaces 286 collectively form anarcuate configuration 290 between the lower end 282 and the upper end284.

Referring again to FIG. 19, the second reflectors 312 are coupled to thefirst reflectors 280, forming the dome-shaped configuration. The leftface 314 and the right face 316 define a reflex angle θ therebetween. Inone embodiment, θ is greater than 180°. More specifically, θ is definedin a range between 181° and 270°. Alternatively, θ is defined in a rangebetween 181° to 220°.

The reflex angle θ terminates in a vertex 320 forming a triangularprotrusion extending toward the central axis C. The vertex 320 iscentrally disposed on the planar surface of the first reflectors 280nearest each of the second reflectors 312. The left face 314 and theright face 316 each include an upper segment 322 and a lower segment 324and define an obtuse angular relationship between the upper segment 322and the lower segment 324 of each of the left and right faces 314, 316,such that the upper segment 322 is at a steeper incline than the lowersegment 324. For illustrative purposes only, this obtuse angularrelationship is illustrated as γ in FIG. 20. Additionally, two adjacentsecond reflectors 312 define an obtuse angular relationship, illustratedas β as described below.

Each of the second reflectors 312 are formed by a pair of next adjacentupper panels 326, 328, which define a primary side 330 and a secondaryside 332. The primary side 330 forms the right face 316 of one of thesecond reflectors 312 and the secondary side 332 forms the left face 314of the next adjacent second reflectors 312. The upper panels 326, 328include the upper segment 322 of the second reflectors 312 describedabove.

Additionally, the upper panels 326, 328 include a pair of legs 334, 336extending from the upper segment 322 and define a slit 338 therebetweenfor allowing the upper panels 326, 328 to bend, forming the secondreflectors 312. The legs 334, 336 form the lower segment 324 of thesecond reflectors 312. The legs 334, 336 may include projections 340,342 extending therefrom for fastening to the first reflectors 280.

Each one of the primary side 330 and the secondary side 332 of the uppersegment 322 includes a second flange 344 extending therefrom. Eachsecond flange 344 attaches to an upper ring 346 for securing the upperpanels 326, 328 of the second reflectors 312. In one embodiment, theslit 338 is aligned with the second side 300 of one of the firstreflectors 280 and the first side 298 of the next adjacent firstreflectors 280, such that one of the legs 334, 336 of the upper panels326, 328 is coupled to one of the first reflectors 280 and the other oneof the legs 334, 336 is coupled to the next adjacent first reflectors280.

In one example, the first reflectors 280 and the second reflectors 312are fabricated from MICRO-4 aluminum, manufactured by ALANOD.Alternatively, the first reflectors 280 and the second reflectors 312may be formed of other suitable materials.

A variety of finishing treatments may be applied to the surface of thefirst reflectors 280 and the second reflectors 312. Varying sizeddimples may be applied to the surface to achieve the desired lightoutput of the lighting assembly 100. This dimpling may be referred to ashammer-tone finishing (not shown). For instance, the dimpling has adiameter of ½ inch or less. In another embodiment, the dimpling has adiameter of ⅜ inch or less, or even ¼ inch or less. Alternatively, thesurface can be left smooth, resulting in a mirror-like finish. The firstreflectors 280 and the second reflectors 312 may have similar ordifferent types of finishing treatments depending on the application ofthe lighting assembly 100. It will be appreciated that any otherappropriate finishing treatments may be applied to the first reflectors280 and the second reflectors 312.

In one example, the first reflectors 280 can be formed or cast as asingle integral unit, as compared to an array of separate reflectors, soas to efficiently absorb heat from the LED assemblies 100. In anotherexample, the first reflectors 280 and second reflectors 312 can beformed or cast as a single integral unit, instead of two arrays ofseparate reflectors that are assembled together.

Other examples of the lighting assembly 100 may further include adimming apparatus (not shown) coupled to the LED system 114 for allowingthe LED system 114 to be dimmed. The dimming apparatus is well known tothose in the lighting arts and may be incorporated into the lightingassembly 100 for dimming the light output from the LED system 114 withinthe lighting assembly 100. Each LED system 114 may be dimmed of fromabout 100% light output to about 10% light output, more typically fromabout 100% light output to about 25% light output, and most typicallyfrom about 100% light output to about 50% light output. Dimming isdesirable because it will help extend the life of each LED system 114 aswell as save energy and costs associated therewith. Additionally,dimming each LED system 114 allows the lighting assembly 100 to remainon in a low output setting for extended periods of time and only consumea relatively small amount of electricity. Remaining on at the low outputsetting is advantageous because it allows the lighting assembly 100 tobe utilized instantly when it is needed and eliminates extended“warm-up” periods before the lighting assembly 100 is outputting lightat a usable level. These “warm-up” periods are a common downfall oflighting assemblies presently available on the market and may take up toten minutes or more when the lighting assembly is switched to an onsetting.

The subject invention also has reduced weight when compared to standardLED assemblies and can achieve a weight reduction of about 50%.Typically, the subject invention is about 33 pounds which permits thelighting assembly to be useful for additional applications that theprior art could not be, such as dome facilities that have fabric typeshells. The weight reduction is achieved by the combination of fins 208and fan 266.

The subject invention is also capable of maintaining a more stableoperating temperature due to the fins 208 and the fan 266 as shown anddescribed above. The more stable operating temperature ensures that theLED will achieve the desired life span and light output. Specifically,the LED boards 228, 230, 232 will achieve an operating temperature ofless than 100° C., preferably from 65-85° C., and more preferably from70-80° C., measured at the temperature sensor area 500. When only finsare used, the LED boards 228, 230, 232 reach a temperature of about 130°C. and the life the LEDs is shortened. The combination of the subjectinvention maintains the operating temperature at or below about 77° C.One additional advantage of the subject invention is that the LED system114 consumes less power as compared to conventional high intensitydischarge (HID) lamps while outputting more light. For example, thesubject invention outputs 10% more light while consuming 54 watts lessthan the similar reflector with a T9 light bulb.

Accordingly, it is to be understood that the above description isintended to be illustrative and not restrictive. Many embodiments andapplications other than the examples provided would be apparent uponreading the above description. The scope should be determined, not withreference to the above description, but should instead be determinedwith reference to the appended claims, along with the full scope ofequivalents to which such claims are entitled. It is anticipated andintended that future developments will occur in the technologiesdiscussed herein, and that the disclosed systems and methods will beincorporated into such future embodiments. In sum, it should beunderstood that the application is capable of modification andvariation.

All terms used in the claims are intended to be given their broadestreasonable constructions and their ordinary meanings as understood bythose knowledgeable in the technologies described herein unless anexplicit indication to the contrary is made herein. In particular, useof the singular articles such as “a,” “the,” “said,” etc. should be readto recite one or more of the indicated elements unless a claim recitesan explicit limitation to the contrary.

The Abstract of the Disclosure is provided to allow the reader toquickly ascertain the nature of the technical disclosure. It issubmitted with the understanding that it will not be used to interpretor limit the scope or meaning of the claims. In addition, in theforegoing Detailed Description, it can be seen that various features aregrouped together in various embodiments for the purpose of streamliningthe disclosure. This method of disclosure is not to be interpreted asreflecting an intention that the claimed embodiments require morefeatures than are expressly recited in each claim. Rather, as thefollowing claims reflect, inventive subject matter lies in less than allfeatures of a single disclosed embodiment. Thus, the following claimsare hereby incorporated into the Detailed Description, with each claimstanding on its own as a separately claimed subject matter.

What is claimed is:
 1. A lighting assembly for illuminating an area, thelighting assembly comprising: a reflector body surrounding an openingand comprising a first array of reflectors disposed about a central axisand collectively forming a dome-shaped configuration, and each one ofthe first array of reflectors defines a lower end, an opposing upper endand a plurality of planar surfaces defined between the lower end and theupper end, wherein the plurality of planar surfaces are separated fromone another by discrete horizontal bends, with the planar surfacescollectively forming an arcuate configuration between the lower end andthe upper end, wherein adjacent ones of the first array of reflectorsare separated by a corresponding crease therebetween; an LED systemcomprising a heat sink and a plurality of LED boards, the heat sinkcomprising a plurality of base plates, each one of the base platescomprising a pair of opposing edges extending vertically between a topedge and a bottom edge, an outer face extending between the opposingedges, and an inner face; wherein the plurality of LED boards arecoupled to the outer face of a corresponding one of the base plates,each one of the LED boards comprising a plurality of LEDs and the LEDboards being spaced apart from the top edge of a corresponding one ofthe base plates by at most two inches and spaced less than one inch fromthe opposing edges; wherein the heat sink further comprises a pluralityof fins extending from the inner face, and the plurality of finscomprises a peak profile decreasing from a middle portion of thecorresponding base plate laterally outward to the opposing ends andwherein the plurality of fins extend from the top edge to the bottomedge of the base plate; each one of the opposing edges of the baseplates is disposed adjacent to a corresponding edge of the other baseplates defining a plurality gaps for passage of air and the plurality offins on the base plates have a plurality of ends coordinating with oneanother to define cross slots fluidly communicating with the pluralityof gaps; wherein each one of the base plates comprises a width extendingperpendicularly from one of the opposing edges to the other of theopposing edges, and the peak profile comprises a maximum heightextending perpendicularly from the middle portion of the correspondingbase plate, wherein a ratio of the width to the maximum height is atleast 3:1; wherein the heat sink has a bottom portion adjacent to thereflector body and a top portion spaced apart from the reflector body,and the plurality of LED boards are coupled to the top portion of theheat sink while the bottom portion does not comprise the plurality ofLED boards; a fan releasably attached to the bottom portion of the heatsink and configured to produce a flow of air through the heat sink fromthe bottom portion through a top portion of the heat sink; and whereineach one of the corresponding creases is offset from a lateral axis of aplurality of corners of the heat sink, the lateral axis extendingradially outward from a center of the heat sink and through the cornerof the heat sink.
 2. The lighting assembly of claim 1 including a secondarray of reflectors disposed about the central axis, and each one of thesecond array of reflectors comprising a left face and a right faceseparated by a vertical bend.
 3. The lighting assembly of claim 1wherein the vertical bend of at least one of the second array ofreflectors intersects the lateral axis of one of the corners of the heatsink.
 4. The lighting assembly of claim 1 wherein the LED boards arespaced at least one half of an inch from the opposing edges.
 5. Thelighting assembly of claim 1 further comprising a housing that defines acavity, and the LED system further includes a cap that is attached tothe housing and has at least a portion of the heat sink disposedtherein, the cap includes an aperture and a plurality of ventscircumferentially spaced apart from one another and configured to pass aflow of air therethrough, which removes heat from the LED system.
 6. Thelighting assembly of claim 5 further comprising: a mounting platereceived within the cap, and the mounting plate has a center holealigned with the aperture of the cap; and a plurality of LED driversreleasably attached to the mounting plate and spaced apart therefrom bya plurality of spacers.